                            nil nil #js {} 0 nil)
               activate-fn (fn [] (set! child-cursors (update child-cursors ckey conj cur)))]
           (activate-fn)
-          (set! (.-active-fn cur) activate-fn)
+          (set! (.-activate-fn cur) activate-fn)
           (set! (.-clean-fn cur)
                 (fn []
                   (set! child-cursors

          (.rawDeref this)
          (set! (.-dirty this) false))))
    (clean [this]
      (when-let [clean-fn (.-clean-fn this)]
        (set! (.-dirty this) true)
        (clean-fn)))
    (updateChild [this key f args]
      (set! (.-change-ks this) [key])
      (apply swap-fn update key f args)

      (when (aget (.-fwatches this) key)
        (set! (.-watchers this) (dec (.-watchers this)))
        (js-delete (.-fwatches this) key)
        (.clean this)))
    (notifyFWatches [this oldVal newVal]
      (goog.object/forEach
       (.-fwatches this)
